P2198 - Lack Of Ho2S-21 Switch, Sensor Indicates Rich
WARNING: This page does not describe the selected car, but rather 30 other vehicles, including the 2004 Mercury Sable, 2004 Mercury Mountaineer, 2004 Mercury Monterey, 2004 Mercury Marauder, and 2004 Mercury Grand Marquis. However, it is still accessible from the selected car via links, so may be relevant.
P2198 - LACK OF HO2S-21 SWITCH, SENSOR INDICATES RICH
| Description: | A Heated Oxygen (HO2S) sensor indicating rich at the end of a test is trying to correct for an over-lean condition. The test fails when the fuel control system no longer detects switching for a calibrated amount of time. | ||
| Possible Causes: | See the possible causes for DTC P2195. | ||
| Diagnostic Aids: | - | ||
| Application | Key On Engine Off | Key On Engine Running | Continuous Memory |
| Dedicated NGV | GO to HA: Natural Gas Fuel Control STEP 9 | GO to HA: Natural Gas Fuel Control STEP 9 | GO to HA: Natural Gas Fuel Control STEP 9 |
| All Others | GO to H: Fuel Control STEP 22 | GO to H: Fuel Control STEP 22 | GO to H: Fuel Control STEP 22 |